The relationship between long-term use of nonsteroidal anti-inflammatory drugs and kidney function in patients with ankylosing spondylitis

Objective@#Although nonsteroidal anti-inflammatory drugs (NSAIDs) are the first-line treatment for ankylosing spondylitis (AS), their effect on kidney function remains unclear. This longitudinal study investigated the correlation between long-term NSAID use and kidney function in patients with AS using electronic medical records. @*Methods@#The electronic medical records of 1,280 patients with AS collected from a single center between January 2001 and December 2018 were reviewed. The Assessment of Spondyloarthritis International Society (ASAS) NSAID Intake Score was used to determine the cumulative dose of all NSAIDs prescribed for a different time intervals. Each ASAS NSAID Intake Score was obtained for intervals of 6 months, 1 year, 2 years, 3 years, 5 years, and 10 years. The correlation between the ASAS NSAID Intake Score and final estimated glomerular filtration rate (eGFR) for each interval was investigated. @*Results@#The mean ASAS Intake Scores for 6-month, 1-year, 2-year, 3-year, 5-year, and 10-year intervals were 55.30, 49.28, 44.84, 44.14, 44.61, and 41.17, respectively. At each interval, the pearson correlation coefficients were −0.018 (95% CI: −0.031 to −0.006, p=0.004), −0.021 (95% CI: −0.039 to −0.004, p=0.018), −0.045 (95% CI: −0.071 to −0.019, p=0.001), −0.069 (95% CI: −0.102 to −0.037, p<0.001), −0.070 (95% CI: −0.114 to −0.026, p=0.002), −0.019 (95% CI: −0.099 to 0.062, p=0.645), respectively. There was a very weak negative relationship between ASAS Intake Score and eGFR at each interval. @*Conclusion@#Long-term NSAID use did not correlate with kidney function based on real-world data in patients with AS.

Distribution of serum uric acid levels and prevalence of hyper- and hypouricemia in a Korean general population of 172,970

Background/Aims@#We investigated the distribution of serum uric acid (SUA) levels and estimated the prevalence of hyperuricemia and hypouricemia in the Korean population. @*Methods@#This cross-sectional study used data from the Korean Genome and Epidemiology Study and included 172,970 participants (58,981 men and 113,989 women) aged 40 to 79 years. Hypouricemia and hyperuricemia were defined as SUA level ≤ 2.0 mg/dL and > 7 mg/dL, respectively. The prevalence of hyperuricemia and hypouricemia was evaluated by age and sex. @*Results@#The mean SUA levels were significantly higher in men than in women (5.71 ± 1.27 mg/dL vs. 4.21 ± 0.96 mg/dL, p < 0.001). The mean SUA levels and prevalence of hyperuricemia increased with age in women but not in men. The overall prevalence of hyperuricemia and that in men and women was 50.82, 133.25, and 8.17 per 1,000 persons, respectively; the overall prevalence of hypouricemia and that in men and women was 4.16, 1.10, and 5.75 per 1,000 persons, respectively. The prevalence of hypouricemia in men was similar across all age groups; however, that in women was the highest in the age group of 40 to 49 years and the lowest in the age group of 50 to 59 years. @*Conclusions@#The distribution of SUA levels and prevalence of hyperuricemia and hypouricemia differed according to age and sex. Age and sex should be considered in studies on uric acid-related diseases.

Use of Quantitative Vertebral Bone Marrow Fat Fraction to Assess Disease Activity and Chronicity in Patients with Ankylosing Spondylitis

Objective@#We quantitatively measured the fat fraction (FF) in the vertebrae of patients with ankylosing spondylitis (AS) using magnetic resonance imaging (MRI) and investigated the role of FF as an indicator of both active inflammation and chronicity. @*Materials and Methods@#A total of 52 patients with AS who underwent spinal MRI were retrospectively evaluated. The FF values of the anterosuperior and anteroinferior corners of the bone marrow in the L1–S1 spine were assessed using the modified Dixon technique. AS activity was measured using the Bath Ankylosing Spondylitis Disease Activity Index (BASDAI), Bath Ankylosing Spondylitis Functional Index (BASFI), AS Disease Activity Score (ASDAS), and serum inflammatory marker levels. AS disease chronicity was assessed by AS disease duration and the modified Stoke Ankylosing Spondylitis Spinal Score (mSASSS). Univariable and multivariable regression analyses were conducted to investigate the correlation between FF and other clinical characteristics. @*Results@#The mean FF ± standard deviation of the total lumbar spine was 43.0% ± 11.3%. At univariable analysis, spinal FF showed significant negative correlation with BASDAI (β = -0.474, p = 0.002) and ASDAS with C-reactive protein (ASDAS-CRP; β = -0.478, p = 0.002) and a significant positive correlation with AS disease duration (β = 0.440, p = 0.001). After adjusting for patient age, sex, and total mSASSS score, spinal FF remained significantly negatively correlated with BASDAI (β = -0.543, p 3.5) than in those with only high disease activity (2.1 ≤ ASDAS-CRP ≤ 3.5) (p = 0.010). @*Conclusion@#Spinal FF may help assess both AS disease activity and chronicity.

J-shaped Relationship Between Chronic Kidney Disease and Serum Uric Acid Levels: A Cross-sectional Study on the Korean Population

Objective@#Both hypouricemia and hyperuricemia are reportedly associated with reduced kidney function. This study investigated the association between uric acid levels and the risk of reduced renal function in men and women. @*Methods@#We conducted a cross-sectional study using data from a government-funded health examinee cohort of a Korean genome and epidemiological study. A total of 172,970 participants (58,981 men, 113,989 women) aged 40∼79 years were included. A logistic regression test was performed, and the odds ratio (OR) and 95% confidence interval (CI) were calculated to examine the relationship between stratified uric acid levels and the frequency of chronic kidney disease. @*Results@#As the uric acid level increased, the risk of reduced renal function increased. Moreover, for uric acid levels ≤2.0 mg/dL, the risk of reduced renal function was higher than that of the reference group. Among the total, man, and woman groups, a statistically significant association was observed in men (OR 1.71, 95% CI 0.945∼3.111, OR 5.003, 95% CI 1.405∼17.809, and OR 1.377, 95% CI 0.696∼2.724, respectively). @*Conclusion@#The OR of reduced renal function according to uric acid levels formed a J-shaped curve in both genders.

Use of Quantitative Vertebral Bone Marrow Fat Fraction to Assess Disease Activity and Chronicity in Patients with Ankylosing Spondylitis

Objective@#We quantitatively measured the fat fraction (FF) in the vertebrae of patients with ankylosing spondylitis (AS) using magnetic resonance imaging (MRI) and investigated the role of FF as an indicator of both active inflammation and chronicity. @*Materials and Methods@#A total of 52 patients with AS who underwent spinal MRI were retrospectively evaluated. The FF values of the anterosuperior and anteroinferior corners of the bone marrow in the L1–S1 spine were assessed using the modified Dixon technique. AS activity was measured using the Bath Ankylosing Spondylitis Disease Activity Index (BASDAI), Bath Ankylosing Spondylitis Functional Index (BASFI), AS Disease Activity Score (ASDAS), and serum inflammatory marker levels. AS disease chronicity was assessed by AS disease duration and the modified Stoke Ankylosing Spondylitis Spinal Score (mSASSS). Univariable and multivariable regression analyses were conducted to investigate the correlation between FF and other clinical characteristics. @*Results@#The mean FF ± standard deviation of the total lumbar spine was 43.0% ± 11.3%. At univariable analysis, spinal FF showed significant negative correlation with BASDAI (β = -0.474, p = 0.002) and ASDAS with C-reactive protein (ASDAS-CRP; β = -0.478, p = 0.002) and a significant positive correlation with AS disease duration (β = 0.440, p = 0.001). After adjusting for patient age, sex, and total mSASSS score, spinal FF remained significantly negatively correlated with BASDAI (β = -0.543, p 3.5) than in those with only high disease activity (2.1 ≤ ASDAS-CRP ≤ 3.5) (p = 0.010). @*Conclusion@#Spinal FF may help assess both AS disease activity and chronicity.

J-shaped Relationship Between Chronic Kidney Disease and Serum Uric Acid Levels: A Cross-sectional Study on the Korean Population

Objective@#Both hypouricemia and hyperuricemia are reportedly associated with reduced kidney function. This study investigated the association between uric acid levels and the risk of reduced renal function in men and women. @*Methods@#We conducted a cross-sectional study using data from a government-funded health examinee cohort of a Korean genome and epidemiological study. A total of 172,970 participants (58,981 men, 113,989 women) aged 40∼79 years were included. A logistic regression test was performed, and the odds ratio (OR) and 95% confidence interval (CI) were calculated to examine the relationship between stratified uric acid levels and the frequency of chronic kidney disease. @*Results@#As the uric acid level increased, the risk of reduced renal function increased. Moreover, for uric acid levels ≤2.0 mg/dL, the risk of reduced renal function was higher than that of the reference group. Among the total, man, and woman groups, a statistically significant association was observed in men (OR 1.71, 95% CI 0.945∼3.111, OR 5.003, 95% CI 1.405∼17.809, and OR 1.377, 95% CI 0.696∼2.724, respectively). @*Conclusion@#The OR of reduced renal function according to uric acid levels formed a J-shaped curve in both genders.

Reliability and Quality of Korean YouTube Videos for Education Regarding Gout

Background@#YouTube has become an increasingly popular educational tool and an important source of healthcare information. We investigated the reliability and quality of the information in Korean-language YouTube videos about gout. @*Methods@#We performed a comprehensive electronic search on April 2, 2021, using the following keywords—“gout,” “acute gout,” “gouty arthritis,” “gout treatment,” and “gout attack”—and identified 140 videos in the Korean language. Two rheumatologists then categorized the videos into three groups: “useful,” “misleading,” and “personal experience.”Reliability was determined using a five-item questionnaire modified from the DISCERN validation tool, and overall quality scores were based on the Global Quality Scale (GQS). @*Results@#Among the 140 videos identified, 105 (75.0%), 29 (20.7%), and 6 (4.3%) were categorized as “useful,” “misleading,” and “personal experience,” respectively. Most videos in the “useful” group were created by rheumatologists (70.5%). The mean DISCERN and GQS scores in the “useful” group (3.3 ± 1.0 and 3.8 ± 0.7) were higher than those in the “misleading” (0.9 ± 1.0 and 1.9 ± 0.6) and “personal experience” groups (0.8 ± 1.2 and 2.0 ± 0.8) (P < 0.001 for both the DISCERN and GQS tools). @*Conclusion@#Approximately 75% of YouTube videos that contain educational material regarding gout were useful; however, we observed some inaccuracies in the medical information provided. Healthcare professionals should closely monitor media content and actively participate in the development of videos that provide accurate medical information.

Analysis of Asian Mitochondrial DNA Haplogroups Associated With the Progression of Knee Osteoarthritis in Koreans

Objective@#. We investigated Asian mitochondrial DNA (mtDNA) haplogroups associated with knee osteoarthritis (OA) progression in a prospective community-based cohort comprised of Koreans. @*Methods@#. Epidemiologic data and Kellgren-Lawrence (K/L) scores of knee radiographs were obtained from the second (2005∼2006) and sixth (2013∼2014) follow-up, and patient DNA was analyzed. The mtDNA haplogroup frequencies (M, G, D, D4, D5, M7, M8, M9, M10, N, A, N9, R, F, and B) were compared between the progression (K/L score change on either knee ≥2 or arthroplasty) and non-progression (K/L score change on both knee ≤1) groups at the sixth follow-up. Multiple logistic regression was performed to determine relative risk (RRs) of mtDNA haplogroups for OA. @*Results@#. In total, 1,115 participants were included, 405 of whom had early OA (higher K/L score on both knees of 1 or 2). Among them, 143 and 166 patients were classified in non-progression and progression groups, respectively, at the sixth follow-up. The most frequent haplogroups, B and D4, in Koreans also showed a high frequency in our study. There were no significantly different haplogroups between the non-progression and progression groups. However, the frequency of haplogroup D4 was likely higher in the non-progression group than in the progression group, although not significantly (13.3% vs. 7.2%, RR=0.51, p=0.081 in the unadjusted model and RR=0.56, p=0.149 in the adjusted model). @*Conclusion@#. No significant haplogroups are related to OA progression. Large-scaled studies are needed to reveal the association between mtDNA haplogroups and OA.

Effect of biologics in the level of cytokines in the synovial fluid of patients with ankylosing spondylitis

Background/Aims@#Biologics are very effective drugs for patients with ankylosing spondylitis (AS). However, there are patients who are not responding to biologics. This study aimed to evaluate the level of tumor necrosis factor α (TNF-α), interleukin (IL)-23, and IL-17 from synovial fluid in patients with AS and rheumatoid arthritis (RA) and differences of the level of those cytokines according to drugs. @*Methods@#Synovial fluid was obtained from 34 patients (42 samples) with AS and 45 patients (47 samples) with RA with active arthritis of the knee, and the cytokine levels were measured. The differences in the levels between patients treated with and without biologics (biologics and non-biologics groups, respectively) were analyzed in AS and RA. The correlations between cytokines were examined in the non-biologics and biologics groups. @*Results@#The TNF-α level in AS was significantly lower than that in RA (p = 0.016). The IL-17 and IL-23 levels were not different between AS and RA (p = 0.409 and p = 0.562, respectively). In AS and RA, TNF-α, IL-17, and IL-23 showed good correlation among each other in the non-biologics group. However, there was no significant correlation in biologics group. In some patients in the AS group, the IL-17 or IL-23 level was markedly elevated in the biologics group. @*Conclusions@#Treatment with biologics affects the cytokine profile in inflammatory synovial fluid in patients with both AS and RA. Furthermore, IL-23 and IL-17 cytokine might be an important factor in some patients who are unresponsive to biologics in AS.

Characteristics of Appendicular Tissue Components in Patients with Rheumatoid Arthritis

BACKGROUND: The purpose of this study was to identify the characteristics of appendicular lean mass (ALM) associated with rheumatoid arthritis (RA) and to analyze appendicular tissue components in patients with RA.METHODS: We prospectively reviewed of patients with RA who underwent dual energy X-ray absorptiometry in a single center. From data of 28 patients, ALM was calculated. Regression analysis was used to investigate the association between ALM and RA. Using propensity score matching, patients with RA were compared to the control group from 18,698 patients of Korea National Health and Nutrition Examination Surveys data. RA and control group were matched in a 1: 5, respectively.RESULTS: In regression model, there was significantly negative association between disease activity score and ALM index in patients with RA in unadjusted (β=−0.387, 95% confidence interval [CI], −0.729 to −0.045) and model adjusted for age, sex, and body mass index (β=−0.227, 95% CI, −0.451 to −0.003). In matching with age and sex, the arms fat mass and fat fraction of RA group were significantly lower than that of control group. In matching with age, sex, and body mass index, the ALM index and legs lean mass of RA group were significantly higher than control group.CONCLUSIONS: Patients with RA have a lower ALM with higher disease activity. In addition, we found that patients with RA had different tissue component in arms and legs compared to general population.

Characteristics of Uveitis in Patients with Ankylosing Spondylitis in Korea: A Single-center Survey

OBJECTIVE: Uveitis is the most common extra-articular manifestation occurring in patients with ankylosing spondylitis (AS). This study examined the characteristics of uveitis in patients with AS using a questionnaire survey. METHODS: A questionnaire-based survey was given to patients enrolled in an AS registry at a rheumatology clinic in a tertiary hospital between September 2015 and December 2015. The patients responded to several questions and sub-questions related to uveitis. RESULTS: A total of 750 patients participated in the survey. The number of patients diagnosed with uveitis in the ophthalmology department was 218 (29%). The most common symptoms in patients with uveitis were ocular injection (61%), eye pain (54%), and decreased visual acuity (51%). Interestingly, 91 of the 532 patients (17%) who had not been diagnosed with uveitis before also experienced similar symptoms, such as tearing, ocular injection, and eye pain. The number of patients who experienced a flare of uveitis more than once a year was 109 (50%), and 124 patients with uveitis responded that the treatment of AS had no significant effect on the prevention of uveitis recurrence. CONCLUSION: The clinical characteristics of uveitis that patients experience was investigated through surveys. Because uveitis in patients with AS is not well diagnosed and treated, active screening for suspected symptoms and the prevention of a recurrence is needed.

Systemic Sclerosis and Pleural Effusion in a Patient with Ankylosing Spondylitis / 대한내과학회지

Systemic sclerosis (SSc) is a chronic autoimmune disorder characterized by endothelial and fibroblast dysfunction, resulting in progressive fibrosis of the skin and internal organs. Ankylosing spondylitis (AS) is an arthritic condition affecting the axial skeleton and peripheral joints. An association between SSc and AS is relatively rare, as the two diseases share few characteristics. Here, we present a case of limited SSc in a 44-year-old man who exhibited low-grade AS, and discuss several cases of coexisting SSc and AS in the literature. Patients with both diseases showed several common features, including male predominance, middle age, and combined interstitial lung disease. However, unlike our case, the patients reported in the literature had advanced ankylosis and diffuse SSc.

Case of Brain Biopsy Proven Giant Cell Arteritis

Giant cell arteritis (GCA) is categorized as vasculitis of the large and medium-sized vessels. Visual loss is one potential consequence of cranial arteritis. Temporal artery biopsies are performed frequently to demonstrate the involvement of arteritis. On the other hand, cerebral artery involvement with pathological findings is not well documented in patients with GCA. We report a rare case of GCA with cerebral vessel involvement in a 76-year-old woman.

Mortality in patients with rheumatoid arthritis-associated interstitial lung disease treated with an anti-tumor necrosis factor agent

BACKGROUND/AIMS: To evaluate the impact on mortality of anti-tumor necrosis factor (anti-TNF) treatment of rheumatoid arthritis-associated interstitial lung disease (RA-ILD). METHODS: We retrospectively reviewed the medical records of 100 RA-ILD patients who visited our tertiary care medical center between 2004 and 2011, identified those treated with an anti-TNF agent, divided patients into non-survivor and survivor groups and evaluated their clinical characteristics and causes of death. RESULTS: A total of 24 RA-ILD patients received anti-TNF therapy, of whom six died (25%). Mean age at initiation of anti-TNF therapy was significantly higher in the nonsurvivor versus survivor group (76 years [range, 66 to 85] vs. 64 years [range, 50 to 81], respectively; p = 0.043). The mean duration of anti-TNF treatment in the non-survivor group was shorter (7 months [range, 2 to 14] vs. 23 months [range, 2 to 58], respectively; p = 0.030). The duration of anti-TNF therapy in all nonsurviving patients was < 12 months. Pulmonary function test results at ILD diagnosis, and cumulative doses of disease-modifying drugs and steroids, did not differ between groups. Five of the six deaths (83%) were related to lung disease, including two diffuse alveolar hemorrhages, two cases of acute exacerbation of ILD, and one of pneumonia. The sixth patient died of septic shock following septic arthritis of the knee. CONCLUSIONS: Lung complications can occur within months of initial anti-TNF treatment in older RA-ILD patients; therefore, anti-TNF therapy should be used with caution in these patients.

The Incidence of Uveitis in Ankylosing Spondylitis Patients Undergoing Tumor Necrosis Factor Inhibiting Therapy in Korea

OBJECTIVE: The purpose of this study is to evaluate the outcome of uveitis in ankylosing spondylitis (AS) during tumor necrosis factor (TNF)-inhibiting therapy and to compare the incidence rate of uveitis in infliximab, adalimumab, and etanercept. METHODS: A retrospective evaluation was performed in AS patients who had started TNF-inhibiting therapy from June 2003 to June 2011. The clinical characteristics of patients with documented uveitis were evaluated. RESULTS: Among 316 patients treated with TNF inhibitor, 26 patients (8%) had experienced uveitis during TNF-inhibiting therapy. Among them, 15 patients were treated with etanercept, eight with adalimumab, and three with infliximab. The overall incidence rate of uveitis flare during therapy with TNF inhibitor was 46 per 1,000 person-years (pys) (95% confidence interval [CI], 32 to 64). The incidence rate did not differ between TNF inhibitors, with 54/1,000 pys (95% CI, 34 to 81) for etanercept, 46/1,000 pys (95% CI, 21 to 87) for adalimumab, and 22/1,000 pys (95% CI, 5 to 64) for infliximab. Fourteen patients experienced a first episode of uveitis. The overall incidence rate of new onset-uveitis after therapy with TNF inhibitor was 19 per 1,000 pys (95% CI, 10 to 31). The incidence rate for etanercept was 24/1,000 pys (95% CI, 12 to 45); adalimumab, 15/1,000 pys (95% CI, 3 to 45); and infliximab, 7/1,000 pys (95% CI, 0 to 40). There was no statistical difference in the incidence of uveitis flare or the cumulative uveitis-free rate among the three TNF inhibitors. CONCLUSION: The relative rate of uveitis, including the first episode, was determined using the TNF inhibitor. However, there was no difference in the incidence rate of uveitis among the three TNF inhibitors.

Clinical Characteristics of Patients with Rheumatoid Arthritis Who have Sustained High Erythrocyte Sedimentation Rates after Clinical Remission

OBJECTIVE: The aim of this study is to determine the clinical characteristics of patients with rheumatoid arthritis (RA) sustaining high erythrocyte sedimentation rate (ESR) despite clinical remission. METHODS: This cross-sectional study involved 91 patients, who visited a tertiary medical center. Patients underwent laboratory tests and a physical examination by a rheumatologist. The disease activity score (DAS) was calculated and patients who were in remission (defined as DAS28-CRP or =40 and <40 mm/hr, respectively). RESULTS: DAS 28-CRP scores revealed that 61 of the 91 patients were in remission. Of these 61 patients, 15 and 46 were allocated to the high and low ESR groups, respectively. Compared to the low ESR group, the high ESR group had a longer disease duration (99.2+/-60.2 vs. 59.1+/-48.9 months), significantly higher white blood cell counts, and CRP levels, total modified Sharp radiographic joint scores, and erosion scores, as well as significantly lower hemoglobin, albumin and alanine aminotransferase levels. CONCLUSION: Patients who have high ESRs despite their remission status may show progressive radiographic change. In such patients, additional treatments that decreases the inflammation and prevents radiological progression should be considered.

A Case Report of Patient with Takayasu's Arteritis Complicated by Reversible Cerebral Vasoconstriction Syndrome

Takayasu's arteritis (TA) is a chronic inflammatory vascular disease that mainly affects large vessels. Central nervous system involvement occurs in about 20% of cases with rare involvement of intracranial vessel, and its typical manifestation is cerebral ischemia or stroke. Reversible cerebral vasoconstriction syndrome (RCVS) is a group of disorders with prolonged, but reversible vasoconstriction of the cerebral arteries with acute-onset, severe, recurrent headaches with or without neurologic signs or symptoms. We report a case of TA in a 17-year old girl who presented with secondary RCVS. She complained of thunderclap headache, seizure and acute stroke. 3-dimensional computed tomography scan and magnetic resonance angiography of head revealed irregular thickening of aortic wall and its main branches with multifocal narrowing of intracranial basilar artery, which improved after oral nimodipine intake. This case highlights RCVS as an unusual manifestation of TA and demonstrates the diagnosis, treatment and response to therapy of RCVS in TA, which resolved after treatment with calcium channel blocker.

A Case of Adult-Onset Still's Disease Presenting with Periorbital Edema

Adult-onset Still's disease (AOSD) is a systemic inflammatory disorder of unknown etiology that is characterized by high-spiking fever, arthralgia, sore throat, and skin rash. The typical rash of AOSD is an evanescent, salmon-colored erythema, which is considered to be the major diagnostic criterion. Recently, other cutaneous manifestations of AOSD, such as persistent plaque and urticaria, have been reported. Here, we report a rare case of AOSD presenting with periorbital swelling and erythema. A 47-year-old woman was presented with periorbital swelling, erythema, high fever, arthritis, and a sore throat. One year prior to admission, she was diagnosed with AOSD based on the diagnostic criteria of Yamaguchi. The patient's periorbital swelling and erythema may not have been associated with periorbital cellulitis because they did not respond to antibiotics but did improve after treatment with steroids. Considering all of her signs and symptoms with a history of AOSD, periorbital lesion was suspected as atypical cutaneous manifestation of AOSD.

A case of photosensitivity reaction after photodynamic therapy for biliary papillomatosis / 대한내과학회지

Photodynamic therapy has been widely used in the treatment of various cancerous diseases. However, photodynamic therapy with a photosensitizer can cause a photosensitivity reaction on the skin. We report a case of a 64-year-old woman diagnosed with photosensitivity reaction after photodynamic therapy using the photosensitizer, porfimer. She presented to the emergency room with a skin rash on her face, neck, and both upper and lower extremities nine days after the photodynamic therapy. She denied any outdoor activity during that period. After administration of systemic corticosteroid and anti-histamine, her skin lesions resolved completely within seven days.

Two Cases of ANCA-associated Pauci-immune Glomerulonephritis with Rheumatoid Arthritis / 대한류마티스학회지

Renal involvement is one of the extra-articular manifestations found in patients with rheumatoid arthritis (RA). Membranous glomerulonephopathy, membranoproliferative glomeruonophritis, secondary amyloidosis, and focal segmental glomerulosclerosis are reported as pathologic diagnoses of renal involvement. However, reports of renal involvement in patients with RA and antineutrophil cytoplasmic autoantibody (ANCA)-associated pauci-immune glomerulonephritis are rare. Recently, we experienced two patients with RA who developed azotemia and were finally diagnosed with ANCA-associated pauci-immune glomerulonephritis. Because of the rarity of these cases, we report two cases in patients with RA with a literature review.